they long suspected this massive piece of roman architecture was not monochrome says rose ella rea. we have never found proof, she says. thanks to the simple cleaning work, we now know that not only the lower parts of the corridor but also the upper areas had decorations. red, green, blue and white would have been the colors of choice, but it wasn't just the interior decorators who left their mark here. some unknown fan scrawled some naughty bits on the walls, symbolizing fertility and prosperity in roman times. someone else left a now fated drawing of the crown of laurels given to the victors in the arena. this writing is not an advertisement for wine, but more likely the abbreviation of a common name for gladiators. everything uncovered here this restorer tells me is a clue to the past. even dirt is an important indicator, he says, of use, of negative, of every object's historical phases. and in this case, dirt that has concealed the colosseum's not just blood spartd but colorful past. ben wedeman, cnn, room. >>> he slipped into a coma seven years ago. now doctors say the brain of